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Some Experiments with the Performance of LAMP Architecture

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Some Experiments with the Performance of LAMP Architecture Some Experiments with the Performance of LAMP Architecture UV Ramana Veritas Software TV Prabhakar IIT Kanpur [email protected] Abstract benchmark the architecture, especially at an application level. But, there has been a substantial amount of work Measurements are very useful to gauge the actual done to analyze the performance of some other Web performance of various architectures and their applications. Emmanuel Cecchet et al [1] compared the components. In this paper we investigate the performance of LAMP architecture with the performance of the LAMP(Linux, Apache, MySQL, performance of EJBs and the performance of Java PHP) architecture and MySQL and PHP components. servlets. They performed the comparison based on two We build a web-site using LAMP and measure the benchmarks, RUBiS [2] and RUBBoS [3]. The paper application level performance. We use “measurements [4] talks about the benchmarks that they developed to as a means” to improve the performance of the perform the comparison. The bottleneck website. We then investigate the performance of the characterization of the work they have done is application when ported to Windows with running IIS presented in [5]. The work presented in [6] discusses and Apache with MySQL and PHP. the performance and scalability of the EJB applications, by performing experiments with different Keywords: LAMP, performance, software architecture types of EJBs (session, entity etc..) on two different open source EJB application servers (JBOSS and JOnAs). 1. Introduction. C. D. Murta, J. M. Almeida and V. A. F. Almeida [7] presented a performance analysis of WWW Server, A large number of web-sites are built using PHP using WebStone benchmark, in the early days of the and MySQL on the Linux platform with Apache as the inception of the World Wide Web. Arun Iyengar et al. web server. This combination is known as the LAMP [8] presented a performance analysis of Web server architecture. Apache, PHP and MySQL are also under high CPU loads. In their work Y. Hu, A. Nanda, available on the Windows platform giving rise to and Q. Yang [9] analyzed the performance of Apache combinations like WAMP (Windows, Apache, Web server on a uniprocessor machine and a 4-CPU MySQL, PHP) and WIMP ( where the IIS webserver is Symmetric Multi-Processor (SMP) machine. Vsevold used instead of Apache). In this paper we present the V. Panteleenko and Vincent W. Freeh [10] analyzed results we obtained while investigating some the Web server performance by simulating Wide Area performance issues related to MySQL and PHP and an Network (WAN) conditions. application built with this architecture. There has been some work in the area of client We first investigate the performance of PHP and emulators. The paper by Gaurav Banga and Peter MYSQL modules independently. We then check the Drushel [11] describes a method to generate bursty performance of an application built using these traffic that temporarily exceeds the capacity of the Web components. We then benchmark the application on server. It also describes the problems that one faces WIMP and WAMP platforms. while measuring the Web server capacity. They have implemented a client emulator that can create bursty 2. Related Work traffic, by using a two process architecture. There are quite a few open source client emulators like HTTPerf, Even though LAMP is a very popular architecture EVE etc. Papers [12] and [13] describe the architecture there has been little work to characterize and of these client emulators. Some work is done to compare the performance of From Table 1 we can observe that C is around 400 a scripting language with that of a programming times faster than PHP in almost all the cases. We can language. Ousterhout in his article [14] describes some also see that simple instructions are faster than function of the results he got while comparing the performance call instructions by a factor of around five in case of of TCL/TK with C++, Java and MFC. The sqlbench PHP program and by a factor of around six in case of C suite provided by MySQL can be used to measure the program. performance of MySQL. The URL [15] talks about some of the results that are obtained by using the Table 2. PHP vs C – Time to compute sqlbench suite. 2.8 GHz Machine 3. PHP vs. C Time Taken Ratio In this section we present the performance of PHP Computation scripting language in comparison to C. The comparison PHP C is done using two different criteria. The first criterion is Fibonacci 290.07 0.6806 426.15 to compare the total number of instructions that a PHP Number program can execute per second versus the number of File I/O 0.1195 0.0098 12.22 instructions that a C program can execute per second. MySQL 0.00125 0.00133 0.942 The second one is to compare the time taken to achieve Access certain functionality using PHP versus the time taken to achieve the same functionality using C. From Table 2 it can be observed that in case of the Fibonacci program, which is computation intensive, C 3.1 Test Bed language performance, is nearly 400 times better than that of PHP. In case of File I/O the performance of C The experiments described here are conducted on still dominates that of PHP, but this time only by a three different machines with different processor clock factor of 10. Finally, in case of MySQL data transfer speeds: P-III 600 MHz, P-III 1 GHz and P-IV 2.8 GHz. even though C performed slightly better in two cases, All these machines had a Linux operating system, with we can say that performance of PHP and C are almost kernel version 2.6.3, PHP version 4.3.4 and gcc version equal. 3.3.2. All these systems have a RAM of 256 mb installed in them. F2. Performance of MySQL can also be substantially improved by eliminating the connection overhead. 3.2 Findings It is known that a database access has a connection F1. C performs about four hundred times faster than overhead. The Figure below shows the graph between PHP in case of compute intensive functions. connection overhead and the processing time. From the figure we can observe that the connection overhead is far more than the actual processing time. Table 1. PHP vs C – number of instructions per This implies that if we can avoid connection overhead, second the performance can be improved substantially. 2.8 GHz Machine Instructions per second Ratio PHP C Computation Simple 281147 1383200824 491 Instructions 9 Function call 517227 232404139 449 Recursive 626159 230399042 367 Function Figure 1.Connection overhead vs. processing time 4. Application benchmark 4.2 Test Bed We investigate the performance of an application The machine on which the Web server and built with the LAMP. This section describes the database server are running, is a P-IV 2.8 GHz response time and throughput of the Gita Supersite processor, 512 MB RAM with Linux kernel version under different situations. 2.6.3. The Web server used is Apache Web server Gita Supersite (http://www.gitasupersite.iitk.ac.in) version 2.0.48 with PHP module version 4.3.4 loaded is a Web application developed to display the verses into it. The database server is MySQL server version and commentary of Bhagavadgita(an ancient text 4.0.18. The client emulator is running on another containing the essence of Indian Philosophy) in all machine with the same configuration as the server. Indian languages. It can also display the verses in Roman script. The data(Sanskrit verses) is stored in the 4.3 Findings database in ISCII{Indian Script Code for Information Interchange} format and is converted into the font code F3. The maximum throughput that can be achieved for of the desired Indian language to be displayed, when Gita Supersite using the LAMP architecture is around the request arrives. twenty six connections per second on a P-IV machine with 2.8GHz processor. The architecture of the Gita Supersite conforms to As seen is figure 2, the two lines indicate the the trasitional LAMP architecture, except that it has an throughput when there is a limit on the number of extra font conversion module. The font conversion server processes and without a limit on the server module does the font conversion from the ISCII code processes. to the ISFOC (Intelligence based Script FOnt Code) code of the respective language. It then returns the ISFOC data back to the PHP module, which does some formatting work on the data and returns it to the Apache Web server for sending it to the client. 4.1 Application Performance Measurement The experimental setup consists of a client emulator which pumps in requests to the server running on a different machine and taking the measurements. Methods like sending requests from multiple machines, running multiple processes to pump the requests, Figure 2. Throughput vs. connections per second running multiple threads and sending a request each, from all of the threads etc. do not give the desired F4. We can improve the throughput of these results. In these methods, we have a fixed number of applications by using a machine with more processor clients that are sending requests. Each client has to stop speed, as the CPU is the bottleneck in this case(Fig 3) after sending a single request, receive the response and then send the request again. This method cannot overload the server, because as soon as the server reaches its limiting capacity, it will delay the processing of the client requests.
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